This is an interesting question!
belong to a group of plants known as the
BRYOPHYTES. Bryophytes have no roots, but they do
have thin (one cell thick!) root-like structures
which serve for attachment and water absorption.
These are known as RHIZOIDS. Some kind of mosses
or Bryophytes attach to the rocks by these
rhizoids. Most mosses have very little resistance
to drying out, and because most of the mosses are
confined to areas which are damp and sheltered,
some kind of rocks are suitable for them to live.
In Wales, for example, the majority of the rocks
are acidic in nature, and this is reflected in
moss species that grow on them. Different species
may occur where the rocks are more base-rich
(carboniferous limestone,for example). Once the
rock has the natural conditions for the moss to
grow(water, acid or basic nutrients), the moss is
going to attach to the rock by means of the rhizoids.
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